I had some problems lately with android 8.1 and Xiaomi Mi Home app, as other members mentioned already in this forum, and now that is solved I noticed another issue with Yeelight bulb groups. I mostly use Mi Home and not Yeelight app because I have many devices that work with Xiaomi ecosystem.
I have two bulb groups, created long time ago, but with version 5.x of Mi Home I can't find my groups any more to control the bulbs simultaneously (you know same color, same brightness etc). Groups are there, because when I try to create a group with the same bulbs I got a message that already exists. I can also see my groups if I want to create a new automation.
Any one noticed that? is this has to do with Yeelight Software? Is it a bug and Xiaomi forgot to add this to new Mi Home or is it somewhere hidden that I can't find it? I don't want to believe that they remove that function from the app permanently.